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  • Title: Lyn Kinase Suppresses the Transcriptional Activity of IRF5 in the TLR-MyD88 Pathway to Restrain the Development of Autoimmunity.
    Author: Ban T, Sato GR, Nishiyama A, Akiyama A, Takasuna M, Umehara M, Suzuki S, Ichino M, Matsunaga S, Kimura A, Kimura Y, Yanai H, Miyashita S, Kuromitsu J, Tsukahara K, Yoshimatsu K, Endo I, Yamamoto T, Hirano H, Ryo A, Taniguchi T, Tamura T.
    Journal: Immunity; 2016 Aug 16; 45(2):319-32. PubMed ID: 27521268.
    Abstract:
    Interferon regulatory factor-5 (IRF5), a transcription factor critical for the induction of innate immune responses, contributes to the pathogenesis of the autoimmune disease systemic lupus erythematosus (SLE) in humans and mice. Lyn, a Src family kinase, is also implicated in human SLE, and Lyn-deficient mice develop an SLE-like disease. Here, we found that Lyn physically interacted with IRF5 to inhibit ubiquitination and phosphorylation of IRF5 in the TLR-MyD88 pathway, thereby suppressing the transcriptional activity of IRF5 in a manner independent of Lyn's kinase activity. Conversely, Lyn did not inhibit NF-κB signaling, another major branch downstream of MyD88. Monoallelic deletion of Irf5 alleviated the hyperproduction of cytokines in TLR-stimulated Lyn(-/-) dendritic cells and the development of SLE-like symptoms in Lyn(-/-) mice. Our results reveal a role for Lyn as a specific suppressor of the TLR-MyD88-IRF5 pathway and illustrate the importance of fine-tuning IRF5 activity for the maintenance of immune homeostasis.
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